I think you completely misunderstood the article, or you have not read it.
The uniqueness from the system comes from the fact that two different numbers will never have the same id.
The pad only works for things like user ids.
You can also change the alphabet it uses so its not case sensitive; using this alphabet: "ABCDEFGHJKLMNPQRSTUVWXYZ0123456789" and a minimum of 8 digits, it will produce 8 digit ids all the way 4294967295 (0xffffffff).
The uniqueness from the system comes from the fact that two different numbers will never have the same id.
The pad only works for things like user ids.
You can also change the alphabet it uses so its not case sensitive; using this alphabet: "ABCDEFGHJKLMNPQRSTUVWXYZ0123456789" and a minimum of 8 digits, it will produce 8 digit ids all the way 4294967295 (0xffffffff).